考察了Ru助剂(0.17%～9.96%)对Co/SiO_2催化剂结构及其费托合成反应性能的影响.结果表明,Ru助剂可降低Co/SiO_2催化剂的还原温度,从而提高其还原度.光电子能谱和扩展X吸收射线精细结构研究表明,即使Ru含量高达9.96%,在Co/SiO_2催化剂焙烧过程中也未观察到Ru物种与Co物种作用形成的化合物.还原后催化剂中Ru趋向于与Co物种紧密接触且分散在催化剂表面.H_2程序升温脱附结果表明,随着Ru含量的增加,位于反应温度附近的H_2脱附峰面积增加,即此时催化剂吸附H2能力提高,因此反应活性单调增加,但存在最佳Ru含量,此时C_(5+)选择性最高.
The effects of Ru content (0.17%-9.96%) on Co/SiO_2 catalyst structure and Fischer-Tropsch synthesis were studied. It was found that Ru could decrease the reduction temperature of the Co/SiO_2 catalyst and increase its reduction degree. X-ray photoelectron spectroscopy and extended X-ray absorption fine structure investigations showed that, even if the gu content was as high as 9.96%, no obvious compound was formed between the Ru and Co species during the calcination of the Co/SiO_2 catalyst. For the reduced catalyst, the metallic Ru was contacted closely with Co species and tended to disperse on the surface of the catalyst. With the increase in Ru content, H_2 desorption corresponding to Fischer-Tropsch synthesis reaction temperature showed a monotonous increase in intensity, and the reactivity increased. When a suitable ruthenium content was introduced, the selectivity for C_(5+) hydrocarbons was improved.
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